Whenever he differs in opinion from writers, whose authority he otherwise reveres, we find his reasoning modest, concise, close, and admirably well adapted to the subject in dispute; but the delicacy of his expression, when he condemns others, and the caution with which he avoids speaking of himself, have led some to believe he was not a practitioner: though the strongest argument against his having practised physic is drawn from the silence of Pliny, who names Celsus, in several books, among the authors from whom he took his materials, and never ranks him in the list of physicians, whom he separates from the others. But I am surprised it has escaped the observation of the critics, that these catalogues of physicians consist only of foreigners, whom Pliny distinguishes from other foreigners, who were not physicians; whereas Celsus stands always amongst the Romans. Now Pliny, in his list of Roman writers, has not noted their several professions: for in most of the places, where we read the name of Celsus, we also find that of Antonius Castor, without any mention of his profession, though Pliny himself in another place tells us[O], he was a physician of great reputation, whom he saw living in retirement, and cultivating a kind of physic-garden, when he was above an hundred years old. Thus, the name of Antonius Castor would have been lost with his writings, notwithstanding the figure he made among his contemporaries, had he not happened to be mentioned by Pliny. And hence it appears, that nothing can be inferred from the silence of Pliny and the other ancients, in regard to the profession of Celsus; though he should not be Cornelius the physician, mentioned by Galen, as Le Clerc thinks it probable he is. [O] Plin. Nat. Hist. lib. xxv. c. 2.